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doc/filters: extend af_channelmap documentation

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Signed-off-by: Marton Balint <cus@passwd.hu>
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Marton Balint 2024-03-19 03:55:12 +01:00
parent eaca78eff8
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1 changed files with 10 additions and 6 deletions
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doc/filters.texi
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@ -4291,14 +4291,18 @@ It accepts the following parameters:
@item map @item map
Map channels from input to output. The argument is a '|'-separated list of Map channels from input to output. The argument is a '|'-separated list of
mappings, each in the @code{@var{in_channel}-@var{out_channel}} or mappings, each in the @code{@var{in_channel}-@var{out_channel}} or
@var{in_channel} form. @var{in_channel} can be either the name of the input @code{@var{in_channel}} form. @var{in_channel} can be either the name of the
channel (e.g. FL for front left) or its index in the input channel layout. input channel (e.g. FL for front left) or its index in the input channel
@var{out_channel} is the name of the output channel or its index in the output layout. @var{out_channel} is the name of the output channel or its index in the
channel layout. If @var{out_channel} is not given then it is implicitly an output channel layout. If @var{out_channel} is not given then it is implicitly
index, starting with zero and increasing by one for each mapping. an index, starting with zero and increasing by one for each mapping. Mixing
different types of mappings is not allowed and will result in a parse error.
@item channel_layout @item channel_layout
The channel layout of the output stream. The channel layout of the output stream. If not specified, then filter will
guess it based on the @var{out_channel} names or the number of mappings.
Guessed layouts will not necessarily contain channels in the order of the
mappings.
@end table @end table
If no mapping is present, the filter will implicitly map input channels to If no mapping is present, the filter will implicitly map input channels to